Method and apparatus for indicating heat



E. i'iAMiWOND.

METHOD AND APPARATUS FOR INDICATING HEAT.

APPLiCATlON HLED FEB. 7, 1920.

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UNITED STATES PATENT OFFICE. F

LAURENS HAMMOND, OFDETROIT, MICHIGAN.

METHOD AND APPARATUS FOR INDICATING HEAT.

Be it known that I, LAURENS HAMMOND, a citizen of the United States,residing at Detroit, county of Wayne, State of Michian, have invented acertain new and useful Improvement in Methods and Apparatus forIndicating Heat, and declare the following to be a full, clear, andexact description of the same, such as will enable others skilled in theart to; which it pertains to make and use the same, reference being hadto the accompanying drawings, which form a part of this specification.

This invention relates to method of and apparatus for detecting Whetheror not an engine or other mechanism has been, heated tocor above acertain temperature.

The object is to provide a means to determine whether or not an engine.or other mechanism has been allowed to overheat or has been heated toor above a certain temperature. Said means is adapted to record thisfact in such a fashion that after such action has taken place it can bedetermined whether or not such temperature point has been reached orpassed.

In the--drawings- Figure 1 is a perspective of a portion of an enginewith my device attached thereto. a

Fig. 2 is an elevation of my device as affixed.

Fig. 3 is a sectional elevation of my device in place. I i

Fig. 4. is a sectional view of. a modification of my device.

Let 6; represent an engine structure and I) my metal stamp or sealaffixed thereto, the

surface or face of this seal or stamp being configured according to anydesired design or in any determined fashion. The inscription appearingon the surface of the seal may very Well be the name of the companymanufacturing the goods to which the seal is to be afiixed. Thisinscription or legend is here indicated by the letter 0.

For the purposes hereinafter set forth,

1 this inscription appearing on the surface of the seal will becontoured or shaped from the material of the seal itself rather thanbeing imprinted or impressed thereon. The seal may be affixed to theengine in any desired manner, as shown in Fig. 4. A boss, as at d, maybe formed on the Wall of the engine, then the same is spot-drilled as ati, so as to provide a recess to receive this seal and retain it inplace.

Specification of Letters Patent.

Patented July 6,1920.

Application filed February 7, 1926. Serial No. 356,999.

Engines and other mechanism and par-- ticularly internal combustionengines are frequently allowed to overheat, due either to carelessness,oversight, imperfect cooling due to a number of causes, et cetera.Consequently the engine is damaged, if not ruined. In the service ofmotor companies, it is frequently found that engines and parts arereturned for replacement Where the fault is obviously not due to adefect in (ill structure or manufacture, but which fact is difficult toprove. The present seal is designed to meet this need. It is.permanently affixed to the engine wall and the engine manufacturersname, trade-mark, or other distinguishing mark is configured on the facethereof. When the temperature of the engine rises above a certain point,the metal of the. seal fuses to an extent sufficient to partially, ifnot completely, obliterate this mark. v

, This aifords a certain means for detecting whether or, not the enginehas been allowed to heat to or above such temperature pointi It isapparent that these seals might be of infinite variety, composed ofvarious materials, aflixed to the engine in very many dif-' ferent waysand in a number of difierent places. These particulars are each andallof little importance as hearing uponthe spirit of the invention.

The process of detecting whether or not an engine, or other mechanismhas been heated to or above a certain temperature is therefore broadlythe scope of this invention. This process consists in affixing to anengine a seal 2) bearing on its face a configuration,such seal beingcomposed of a substance adapted to fuse sufficiently to partially, ifnot completely, eiface said configuration at a point substantially nearthe boiling point of water, such point being at least. substantiallylower than the fusing point of the engine structure itself.

Claims:

1. The process ofdetecting whether or not an engine has been heated to acertain temperature by afiixing thereto a configured stamp formed ofsuch material that when the engine has been heated to such temperaturethe stamp will fuse sufficiently to obliterate the configuration thereonso as to indicate such fact.

2. A seal adapted to be afiixed to an engine, said seal bearing on itsface, an inscription, and being composed of a material adapted to fusesufficiently to substantially erase said inscription at a temperaturewhich would injure the engine.

3. A' manufacturers name-plate adapted LAURENS HAMMOND.

